# US 12,113,235 B2 · Cylindrical battery and method for manufacturing the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,235 B2 - Document ID: US12113235B2 - Status: Granted - Kind: B2 - Application number: 17/613,297 - Filed: 2020-07-17 - Published: 2022-07-14 - Granted: 2024-10-08 - Earliest claimed: 2019-07-17 - Assignees: LG Energy Solution, Ltd. - Applicants: LG Energy Solution, Ltd. - Inventors: Han A Noh - Web page: https://patentgrep.com/patent/US12113235B2 ## CPC - H01M 50/107: having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) - H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member} - H01M 10/0422: {Cells or battery with cylindrical casing} - H01M 10/052: Li-accumulators - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 10/488: {Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density} - H01M 50/119: Metals - H01M 50/152: for cells having curved cross-section, e.g. round or elliptic (H01M50/15, H01M50/153 take precedence) - H01M 50/159: Metals - H01M 50/169: by welding, brazing or soldering - H01M 50/184: characterised by their shape or structure - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/191: Inorganic material - H01M 50/578: in response to pressure - H01M 50/583: in response to current, e.g. fuses - H01M 50/636: Closing or sealing filling ports, e.g. using lids - H01M 2200/20: Pressure-sensitive devices - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A cylindrical battery includes a metal can, an electrode assembly mounted in the metal can, and a cap assembly located at an upper end of the metal can, the cap assembly including a top cap, a safety vent, and a current shut-off member. A hole mark is formed on the safety vent. ## Claims ### Claim 1 A cylindrical battery, comprising: a metal can; an electrode assembly mounted in the metal can; and a cap assembly located at an upper end of the metal can, the cap assembly including: a top cap; a safety vent; and a current shut-off member, wherein a hole mark is formed on the safety vent, wherein a notch is formed at the hole mark, and wherein the hole mark is a dye that is applied to the notch. ### Claim 2 (depends on 1) The cylindrical battery of claim 1, wherein the top cap comprises an exhaust hole. ### Claim 3 (depends on 2) The cylindrical battery of claim 2, wherein an opening is formed in the current shut-off member. ### Claim 4 (depends on 3) The cylindrical battery of claim 3, wherein the exhaust hole, the hole mark, and the opening are located along an imaginary straight line that is perpendicular to a bottom of the metal can. ### Claim 5 (depends on 1) The cylindrical battery of claim 1, wherein the top cap makes contact with the safety vent along a periphery of the safety vent. ### Claim 6 (depends on 5) The cylindrical battery of claim 5, wherein the hole mark is formed on the periphery of the safety vent. ### Claim 7 A cylindrical battery, comprising: a metal can; an electrode assembly mounted in the metal can; and a cap assembly located at an upper end of the metal can, the cap assembly including: a top cap; a safety vent; and a current shut-off member, wherein a hole mark is formed on the safety vent, wherein the top cap comprises an exhaust hole, and wherein the hole mark is applied with a dye that is visible by naked eyes through the exhaust hole. ### Claim 8 (depends on 7) The cylindrical battery of claim 7, wherein the dye is a fluorescent dye. ### Claim 9 (depends on 1) The cylindrical battery of claim 1, wherein the top cap comprises two or more exhaust holes. ### Claim 10 A cylindrical battery, comprising: a metal can; an electrode assembly mounted in the metal can; and a cap assembly located at an upper end of the metal can, the cap assembly including: a top cap having two or more exhaust holes; a safety vent; and a current shut-off member, wherein a hole mark is formed on the safety vent, wherein a notch is formed at the hole mark, wherein the top cap comprises two or more exhaust holes, and wherein the hole mark is provided as two or more hole marks corresponding to the exhaust holes. ### Claim 11 (depends on 1) A method for manufacturing a cylindrical battery of claim 1 by adding an electrolyte to the cylindrical battery, the method comprising the steps of: forming a through-hole at the hole mark; inserting an electrolyte injection tube into the through-hole; injecting an electrolyte through the electrolyte injection tube; removing the electrolyte injection tube; and sealing the through-hole. ### Claim 12 (depends on 11) The method of claim 11, wherein the electrolyte injection tube passes through the hole mark while being inclined at a predetermined angle toward the outside of the cylindrical battery with respect to an imaginary straight line that is perpendicular to a bottom of the metal can. ### Claim 13 (depends on 12) The method of claim 12, wherein the predetermined angle is fifty degrees or less. ### Claim 14 (depends on 11) The method of claim 11, wherein the step of sealing the through-hole comprises a step of sealing the through-hole through laser welding. ### Claim 15 (depends on 11) The method of claim 11, wherein the step of sealing the through-hole comprises a step of sealing the through-hole with silicone. ### Claim 16 (depends on 7) The cylindrical battery of claim 7, wherein an opening is formed in the current shut-off member. ### Claim 17 (depends on 16) The cylindrical battery of claim 16, wherein the exhaust hole, the hole mark, and the opening are located along an imaginary straight line that is perpendicular to a bottom of the metal can. ### Claim 18 (depends on 7) The cylindrical battery of claim 7, wherein the top cap makes contact with the safety vent along a periphery of the safety vent, and wherein the hole mark is formed on the periphery of the safety vent.